An Open-Label Extension Study to Evaluate Safety & Tolerability of QR-421a in Subjects With Retinitis Pigmentosa
Public ClinicalTrials.gov record NCT05085964. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
An Open-Label Extension Study to Evaluate the Safety and Tolerability of QR 421a in Subjects With Retinitis Pigmentosa (RP) Due to Mutations in Exon 13 of the USH2A Gene (Helia)
Study identification
- NCT ID
- NCT05085964
- Recruitment status
- Terminated
- Study type
- Interventional
- Phase
- Phase 2
- Lead sponsor
- Laboratoires Thea
- Industry
- Enrollment
- 21 participants
Conditions and interventions
Conditions
Interventions
- RNA antisense oligonucleotide for intravitreal injection Drug
Drug
Eligibility (public fields only)
- Age range
- 12 Years and older
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Sep 15, 2021
- Primary completion
- Oct 17, 2022
- Completion
- Oct 17, 2022
- Last update posted
- Aug 6, 2024
2021 – 2022
United States locations
- U.S. sites
- 4
- U.S. states
- 4
- U.S. cities
- 4
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Center for Clinical Research Operations, Massachusetts Eye and Ear | Boston | Massachusetts | 02114 | — |
| University of Michigan, Kellogg Eye Center | Ann Arbor | Michigan | 48105 | — |
| Casey Eye Institute, Oregon Health & Science University | Portland | Oregon | 97239 | — |
| Retina Foundation of the Southwest | Dallas | Texas | 75231 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
Non-U.S. locations
This page focuses on the U.S. directory. The official record also lists 3 non-U.S. sites.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT05085964, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Aug 6, 2024 · Synced Jul 21, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT05085964 live on ClinicalTrials.gov.